Oil-burner.



J. A. TRIMBLE & C. H. MILLER.

OIL BURNER.

APPLICATION FILED 11.2, 1913.

Patented Feb. 10, 1914.

IN VENTURS p h A.Tr|r:n ble,

WITNESSES close M1 rLMaller; Q Ma ATTORNEYS JOSEPH-ARTHUR TRIMBLE AND CARL 1113mm MILLER, or PORTLAND, OREGON.

OIL-BURNER.

Specification of Letters Patent.

Patented Feb. 10, 1914.

Application filed April 2, 1913. Serial No. 758,355.

To all whom it may concern:

Be it known that we, JOSEPH A. TR'IMBLE and CARL H. MILLER, citizens of the United States, and residents of Portland, in the county of Multnomah and State of Oregon, have invented a new and Improved Oil- Burner, of which the following is a full, clear, and exact description.

Our invention relates to improvements in oil burners, and the object thereof is to provide a construction of this type which will include a mixing chamber arranged to connect at one end with a nozzle through which the fuel is supplied to be burnt, and at its other end with a port to admit a mixture of air and products of combustion to mix with and heat the oil before it reaches the nozzle. The burner is adapted when supported in position to have the saidport located above the nozzle, with the result that the mixture of air and products of combustion which enters the burner first passes through the flame and becomes heated so as to raise the temperature of the fuel oil almost to the flash point. In consequence, the burner operates with a steady flame and without the flickering or explosions so common in apparatus of this type.

Reference is to be had to the accompanying drawings forming a part of this specification, in which the same characters of reference indicate the same parts in both the views.

Figure 1 is a vertical longitudinal section showing a section of the fire box in which our burner is mounted in broken lines; and Fig. 2 is a top plan of our burner.

Our burner comprises a casting 1, which is mounted in thewall of the fire box of a locomotive or other engine adapted to run upon liquid fuel, and it is provided at its outer end with an internally-threadedboss 2, and another internally-threaded boss 3.

The first boss receives an oil pipe 4, and as the burner is to be preferably of the gravityfeed type, this boss extends upward, and the pipe 4 has its lower end screwed into the .same so as to permit a free flow of oilinto the casting. ,The other boss 3 receives a pipe 5 which is employed to conduct steam to the inside of the casting, this steam serving a function which will appear later. Inside the castin is a longitudinal horizontal web 6, which ivides the same into internal passages 7 and 8. The inner end of the casting terminates in a nozzle 9 throughwhich the fuel is discharged to be burned, and in rear of this nozzle and opening to the inside of the burner through the top of the casting is a port 10, this port serving for/ 0 the admission of a mixture of air and products of combustion which mixes with the fuel and heats it before the same passes out through the nozzle 9. The end of the web 6 adjacent the nozzle 9 is turned down toward the bottom of the casting 1, as shown at 12, leaving a constricted port through which the steam flows out through the nozzle 9, and allowing a space between the nozzle and the port 10, which makes a continuation of the passage 7 and serves as a mixing chamber. This mixing chamber allows of a free flow of the oilmixed with air and combustiongases from the inside of the fire box, so that the temperature of the oil is raised to almost the flash point when it issues from the nozzle and is ignited. I

As is well known, oil furnaces are generallyso constructed that air to support the combustion is supplied from below, and it will be seen that any air entering below the'burner and which "passes in front of the nozzle 9, at which combustion is taking place, will be heated before it-"can passin through the port 10. Steam supplied through the pipe 5 rushes by way of the port at 12 out through the nozzle and drawsvoil with 'it, and the passage ofthe oil past the port 10 will serve to create'a vacuum suflicient to draw in air and combustion gases from the inside of the fire-box by way of the port 10. Since, as stated above, this air must enter the fire box from below, as shown by the dotted-line arrows on Fig. 1, it will pass through the flame of the burner shown and other similar burners which make up the furnace, and be highly heated before it en ters the port leading to the mixing chamber 11. perature raised and may even be vaporized before it issues from the nozzle 9, so that it can be ignited at once and burn with a free, steady flame as long as fuel is supplied to our burner.

Of course, as many burners will be employed as are necessary, and they will be mounted side by side in the wall of the fire box at different points, to give the desired effect. They will all, however, have their ports 10 located on top, and when a battery of these burners is in operation, providing a line of jets across the interior of the fur- Consequently, the oil will have its temnace, the heating effect of the same on the air risin from below assing through the flames 0 the burnin .uel before reaching the port 10, can readi y be appreciated.

We have found in practice that our burner is very etlicient, because of the above-described operation, and the advantages which we obtain are due to heating the air and other gases before they enter the mixing chamber 11, so as to raise the temperature of the oil and make the same readily ignitible. We thus accomplish a great saving of fuel, besides the uniform flame and even heating effect which our burner affords.

The above described operation is illustrative only, and we do not desire to be limited to the exact form of the burner shown and described, but wish to reserve to ourselves the right to make such changes in the shape, size and arrangement of the parts as fairly fall within the scope and spirit of our invention.'

Having'thus described our invention, we claim as new and desire to secure by Letters Patent:

1. A burner, comprising. a hollow body having its upper Wall at its inner end depressed to form a nozzle and provided with a port in its top adjacent the nozzle, the body bein further provided with a horizontal longitudinal partition dividing the same into two passages, each having at its outer end' means for the connection of a pipe thereto, the inner end of the partition terminating a short distance in front of the port and having its end bent downwardly to form a constricted-port for the lower-passage, the space between the said port and the inner end of the nozzle forming a mixing chamber.

2. The combination of a casting having a horizontal longitudinal partition or web therein dividing the same into two passages, and having a discharge opening communicating with both of said passages, said web havingits end adjacent the discharge opening turned downwardl to provide free communication between tile discharge opening and one of said passages, and to constrict communication between the discharge opening and the other assage, means for supplying fuel to the rst passage, and means for supplying fluid to the other passage to pass through the same and said discharge opening and facilitate the flow of the fuel,

and an inlet to the fuel passage in rear of the discharge opening, the space between said inlet and the discharge opening forming a mixing chamber, sald inlet being located so as to be on top of the casting when the same is in position to supply heated air and gas to said fuel for the purpose set forth.

In testimony whereof we have signed our names to this specification in the presence of two subscribed witnesses.

JOSEPH ARTHUR TRIMBLE. CARL HENRY MILLER. Witnesses:

JOHN A. MCKEE, O. M. KNOWLTON. 

